Pixel aspect ratio depends both on the aspect ratio of the display device (your monitor) and the resolution that fits onto that screen. Most monitors use a 4 x 3 aspect ratio so that to achieve square 1:1 pixels, the resolution must also be 4:3. 1024 x 768 will achieve this as well as 640 x 480. The Amiga typically uses a non-square aspect ratio of about 1.2:1 such as 320 x 200, 640 x 400, 768 x 480, etc. So the pixel ratio can be found using...
(horiz res. / horiz display size) : (vert res. / vert display size)If your monitor has a 4:3 aspect, you should have 1:1 pixels.
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